This GCHQ presentation from November 2010 shows that the agency was logging 30 billion metadata records per day by that year: see the Intercept article Profiled: From Radio to Porn, British Spies Track Web Users’ Online Identities, 25 September 2015.
This page taken from a longer 2 July 2010 GCHQ report on the state of its COMSAT capabilities (against communications satellites) confirms that “NSA has historically been a large source of funding” for this aspect of the agency’s activies: see the Intercept article GCHQ and Me: My Life Unmasking British Eavesdroppers, 3 August 2015.
This two-page extract from a longer, undated, GCHQ document describing its presence in Cyprus, states that “Under the ECHELON Agreement, NSA provides 50% of the funding for the SOUNDER Comsat facility”: see the Intercept article GCHQ and Me: My Life Unmasking British Eavesdroppers, 3 August 2015.
This undated NSA slide provides the locations of FORNSAT sites run by the agency and its Five Eyes partners worldwide: see the Der Spiegel article The NSA in Germany: Snowden’s Documents Available for Download, 18 June 2014.
A 2012 report from GCHQ describes a method of “staining” electronic traffic to distinguish between anonymous Tor users: see the Washington Post article Secret NSA documents show campaign against Tor encrypted network, 4 October 2013.